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AssigneeThe Secretary of State for Defence in her Britannic Majesty's Government of the U.K. of Great Britain and Northern Ireland
InventorsStephen M. Burkinshaw, Philip J. Brown
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A method is provide for dyeing a non-cellulosic organic material with a dye, preferably a vat dye, comprising (a) treating the material with a dye in the presence of a reducing agent and an alkali and (b) oxidising the treated material produced in step (a) characterised in that the concentration of reducing agent used in step (a) is increased above that used for conventional vat dyeing such that the resultant dyed material has a lightfastness of 5 or more by BS1006 B01 and B02 (1978) and/or has a washfastness of 5 or more by British Standard Test BS1006 CO6.C2 (1981). Preferably the step (a) is carried out in the presence of an alkali in concentration of greater than 0.1 molar, more preferably a concentration of 0.2 molar or more and most preferably greater than 1 molar. The method provides vat dyed non-cellulosic organic materials having a reflectance of infra-red light of wavelength 400 nm to 680 nm of less than 15%.
A method of vat-dyeing a non-cellulosic organic material such that the resulting dyed material has a washfastness by British Standard Test BS1006 CO6C2 (1981) of 5 or more, said method consisting essentially of the following steps:
A method of vat-dyeing a non-cellulosic organic material such that the resulting dyed material has a lightfastness by British Standard Test BS1006 B01 and B02 (1978) of 5 or more, said method consisting essentially of the following steps:
A method of dyeing a non-cellulosic organic material such that the resulting dyed material has improved visual and near infra-red camouflage reflectance properties, said method consisting essentially of the following steps:
Dependencies are inferred from the claim text.